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math error when using quadratic formula. When graphing quadratic functions by hand we will often use the quadratic formula to obtain the roots or x-intercepts of the function. Example Click to try 2 x 2.
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X 34 - sqrt 4 172 - 4 64 2. X b b2 4ac 2a. Look at the line mathsqrtB52 - 4A5C5.
X 34 - sqrt 342 - 4 64 2.
X -b _ sqrtb2 -4ac 2a In your case a1 b8 and c 121. X 2 32. Although the quadratic formula works on any quadratic equation in standard form it is easy to make errors in substituting the values into the formula. Then separately we will work on finding the vertex of the function since this point defines the lowest or highest point on the graph as well as the line of symmetry.
